165155656511 has 8 divisors (see below), whose sum is σ = 165377998800. Its totient is φ = 164933461440.

The previous prime is 165155656493. The next prime is 165155656553. The reversal of 165155656511 is 115656551561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165155656511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165155656111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2307755 + ... + 2378243.

It is an arithmetic number, because the mean of its divisors is an integer number (20672249850).

Almost surely, 2^165155656511 is an apocalyptic number.

165155656511 is a deficient number, since it is larger than the sum of its proper divisors (222342289).

165155656511 is a wasteful number, since it uses less digits than its factorization.

165155656511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73609.

The product of its digits is 675000, while the sum is 47.

The spelling of 165155656511 in words is "one hundred sixty-five billion, one hundred fifty-five million, six hundred fifty-six thousand, five hundred eleven".